US4000180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 2-dihalovinyl-3,3-dimethyl cyclo propane derivatives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1975-08-04
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Granted: 1976-12-28
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Expires: 1995-08-04
Abstract
Abstract A process for the preparation of a compound of formula: ##STR1## wherein X is chlorine or bromine, and Q is selected from the group consisting of cyano, acetyl and alkoxycarbonyl which comprises the step of heating a compound of formula: ##STR2## wherein R is a lower alkyl group, for a period of from one to 30 hours, at a temperature in the range 130° to 200° C in a polar aprotic solvent in the presence of at least two molar equivalents of water.
Inventors
- 👤 Nazim Punja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:39
CPC Classifications
C; C07; C07C; C07C255/00; C07C45/00; C07C45/61; C07C45/67; C07C45/673
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
A process for the preparation of a compound of formula: ##STR5## wherein X is chlorine or bromine, and Q is selected from the group consisting of cyano, acetyl and alkoxycarbonyl which comprises the step of heating a compound of formula: ##STR6## wherein R is a lower alkyl group, for a period of from one to 30 hours, at a temperature in the range 130° to 200° C in a polar aprotic solvent in the presence of at least two molar equivalents of water.
Claim 2
Dependent Claim
83 words
A process for the preparation of a compound of formula: ##STR5## wherein X is chlorine or bromine, and Q is selected from the group consisting of cyano, acetyl and alkoxycarbonyl which comprises the step of heating a compound of formula: ##STR6## wherein R is a lower alkyl group, for a period of from one to 30 hours, at a temperature in the range 130° to 200° C in a polar aprotic solvent in the presence of at least two molar equivalents of water.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1 wherein the polar aprotic solvent is dimethylsulphoxide, dimethylformamide or dimethylacetamide.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1 and carried out in the presence of an alkali metal halide or alkali metal cyanide.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 3 in which the alkali metal halide is sodium chloride, sodium bromide or sodium iodide.
Claim 6
Dependent Claim
19 words
A process as claimed in claim 3 in which the alkali metal cyanide is sodium cyanide or potassium cyanide.
Claim 7
Dependent Claim
21 words
A process as claimed in claim 1 in which the period of heating is in the range 5 to 20 hours.
Claim 8
Dependent Claim
18 words
A process as claimed in claim 1 in which the heating is carried out under an inert atmosphere.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein Q is --CO 2 R, R being alkyl.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein R is ethyl and X is chlorine.
Claim 11
Dependent Claim
23 words
The process of claim 9 wherein the solvent is dimethyl sulphoxide and the heating is carried out in the presence of sodium chloride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |